RFR: 8332824: GenShen: Temporarily revert recent changes to GC helpers

[Kelvin Nilsen]

On Thu, 23 May 2024 13:31:46 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This reverts commit 8f808276edfb163c14223f642f12dc6faddc49c6. This commit is breaking in stress test pipelines. I'm backing it out while it is debugged.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/437#pullrequestreview-2074366011